Champignons and egg yolks contain quite a lot of Vitamin D. I often prepare egg - champignons 'kotlety', it's very simple and delicious both warm and cold. You need:
5 hard boiled eggs
1 raw egg
5 champignons
4 tablespoons of breadcrumbs
3 tablespoons of finely cut parsley leaves or dill (optional)
1 onion
1/2 teaspoon of salt
3 tablespoons of oil for frying plus some extra breadcrumbs
Cut the onion finely and fry it on some butter (e.g. ghee). Grate hard-boiled eggs and champignons into a bowl. Add the onion, raw egg, bradcrumbs, salt, parsley (I prefer dill) and mix the paste thoroughly. Leave for 15 minutes. Then form small round 'kotlety' cutlets and toss them in some extra breadcrumbs. Fry them on 3 tablespoons of oil for several minutes on each side until golden. I cooked them today and have already eaten all of them